There is no "score" if you have no credit. Until someone gets something put on their credit reports (a new credit card account, installment loan, or something bad such as a collection) they do not have a score at all. If said individual were to pull up their reports they would receive an "N/A".
Let's say an individual (regardless of age) has nothing on their reports and decides to get a credit card, after that first on-time payment was made, they would have around a 600 mid-score, and the more on-time payment are made, mixed with the account aging, his/her score would begin to gradually increase.
Consumers who have the best scores out there typically have an average account age of 3 years, with at least two open revolving lines of credit, one open installment account and low balances with NO late payments and/or collections. Good luck.